Question

Which of the following is the equation of the axis of symmetry of the quadratic equation
y = 2(x + 7)^2 - 4?

x = 7
x = -4
x = 4
x = -7

Answer 1

the line of symmetry will pass through the minimum value of the curve which is when the squared term is = zero.
which value of x makes 2(x +7)2 = 0?

Answer 2

what value of x will make x + 7 = 0

Answer 3

-7?

Answer 4

right - so line of symmetry is x = -7

Answer 5

ah, thanks!

Answer 6

yw